Which of the following set contains species having same angle around the central atom ?

Options

A. `SF_(4), CH_(4), NH_(3)`
B. `NF_(3),BCl_(3),NH_(3)`
C. `BF_(3),NF_(3),AlCl_(3)`
D. `BF_(3),BC l_(3),BBr_(3)`

Answer

To determine which set of species has the same bond angle around the central atom, we need to analyze the molecular geometry of each species in the provided options. Let's go through the analysis step by step.

### Step 1: Identify the species in each option
We will examine the bond angles of the following species:
1. **SF4**
2. **CH4**
3. **NH3**
4. **NF3**
5. **BCl3**
6. **BF3**
7. **AlCl3**
8. **BBR3**

### Step 2: Determine the molecular geometry and bond angles
1. **SF4**:
- Central atom: Sulfur (S)
- Valence electrons: 6 (Group 16)
- Structure: 4 bond pairs and 1 lone pair (seesaw geometry)
- Bond angle: Distorted from 90° and 120° due to lone pair repulsion.

2. **CH4**:
- Central atom: Carbon (C)
- Valence electrons: 4 (Group 14)
- Structure: 4 bond pairs (tetrahedral geometry)
- Bond angle: 109.5°.

3. **NH3**:
- Central atom: Nitrogen (N)
- Valence electrons: 5 (Group 15)
- Structure: 3 bond pairs and 1 lone pair (trigonal pyramidal geometry)
- Bond angle: Approximately 107°.

4. **NF3**:
- Central atom: Nitrogen (N)
- Valence electrons: 5 (Group 15)
- Structure: 3 bond pairs and 1 lone pair (trigonal pyramidal geometry)
- Bond angle: Approximately 102°.

5. **BCl3**:
- Central atom: Boron (B)
- Valence electrons: 3 (Group 13)
- Structure: 3 bond pairs (trigonal planar geometry)
- Bond angle: 120°.

6. **BF3**:
- Central atom: Boron (B)
- Valence electrons: 3 (Group 13)
- Structure: 3 bond pairs (trigonal planar geometry)
- Bond angle: 120°.

7. **AlCl3**:
- Central atom: Aluminum (Al)
- Valence electrons: 3 (Group 13)
- Structure: 3 bond pairs (trigonal planar geometry)
- Bond angle: 120°.

8. **BBR3**:
- Central atom: Boron (B)
- Valence electrons: 3 (Group 13)
- Structure: 3 bond pairs (trigonal planar geometry)
- Bond angle: 120°.

### Step 3: Compare the bond angles
- **SF4**: Distorted angles due to lone pair.
- **CH4**: 109.5°.
- **NH3**: Approximately 107°.
- **NF3**: Approximately 102°.
- **BCl3**: 120°.
- **BF3**: 120°.
- **AlCl3**: 120°.
- **BBR3**: 120°.

### Conclusion
The species that have the same bond angle are **BF3, BCl3, and BBr3**, all having a bond angle of **120°**.

Thus, the correct answer is **D: BF3, BCl3, BBr3**.